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i41CX+

i41CX+

RPN Calc with Printer and CAS

107 ratings
266 reviews
🔧 Utilities
📊 Productivity
$24.99

Details

Released
February 1, 2019
Updated
October 28, 2026

Features

Developer

Antonio Lagana
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i41CX+ screenshot #1 for iPhone
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Reviews summary↘︎
⭐266
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🔄6+ apps
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❓5 answered
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📦~ in 6 days
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About

This advanced RPN scientific calculator offers workstation-class Computer Algebra System (CAS) capabilities, going beyond traditional replicas. It provides access to an extensive library of modules and programs, enhanced with iOS features, customizable skins, and iCloud support for seamless data management.

✓RPN logic with 4-element stack
✓Extensive memory registers
✓Over 400 built-in functions
✓Computer Algebra System (CAS)
✓Virtual thermal printer/plotter
✓Access to HP-41 module library
✓Customizable skins and keyboard overlays
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What users say about i41CX+

Reviews of i41CX+ are mostly positive: the Productivity app is rated 4.8/5 from 107 App Store ratings. What users like most: fantastic emulation of the original HP41 calculator, faithful to the original hardware and functionality. Top complaints: can drain battery when left on, small button size can lead to mis-taps. Summarized from real user reviews.

Positive things

  • 🚀Fantastic emulation of the original HP41 calculator
  • 🔒Faithful to the original hardware and functionality
  • 👍Includes all the expansion modules and accessories
  • 👍Responsive and never crashes
  • 👍Excellent implementation of RPN and programmability
  • 👍Convenient to have a powerful calculator always on hand
  • 👍Impressive attention to detail, including keyboard clicks

Negative things

  • 🔋Can drain battery when left on
  • 👎Small button size can lead to mis-taps
  • 👎Slow startup time in some versions
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+1

What's New in i41CX+

7.7.2

October 28, 2026

• Minor bug fixes and internal optimizations.

User reviews

Most RecentHighest RatedLowest Rated

Fabulous simulator app - strong recommend!

This is a fantastic simulation of an HP41CV/CX calculator. I have used this as my regular carry calculator on my iPhone for years and its fidelity to my late beloved 41CV is immaculate. I’ve dug out all my old printouts and recreated complex financial, role playing and game programs which this app runs with never a bug. After I recently received my iPhone Duo I loaded the app which ran fine in the standard iPhone layout, but then within just 1 or 2 days the developer uploaded an upgrade which made full use of the Duo’s screen! Great work. Highly recommended!
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Llinzc

An outstanding app. The only calculator I use.

I’ve had this for many, many years and it has been updated all the same. I love this application and the calculator with its capabilities. Can’t rate this high enough!
Uunixwzrd

HP41 étendue

Pour les fans d’HP41 et même de la récente DM41X, cette version software comporte des fonctionnalités étendues extraordinaires . Notamment dans le domaine du chargement, déchargement de programmes (et de modules) et leur édition externe. Un outil incontournable pour tous ceux qui travaillent depuis 40 dans l’univers de calcul et de programmation HP41
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NNetfinger

Thank you for this fantastic app!

The HP41 was a breakthrough calculator in its time. I still love it, and the i41CX+ app is a wonderful implementation of this great calc. Worth every penny!
ISIT Problem Solver

iOSで動く最高の電卓の一つ

HP-41Cシリーズには膨大な数のモジュールがあり、このi41CX+で利用することができます。
さらにREDUCEというCASが搭載されているのでモダンな数学用の電卓にもひけを取りません。
iOSで動く最高の電卓の一つだと思います。
CCoCo21xyz
See 261 more reviews

Developer apps

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In-App Purchases
iCAS
iCAS

by Antonio Lagana

📊 Productivity

(6)

$14.99
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User experience

🐞

Reported Bugs

2 issues

Issues with the 41Z math module producing garbled output

Bug

Scaling problems with overlays

Bug
✨

Requested Features

4 requests

Landscape mode for better button size

Feature

Haptic feedback for button presses

Feature

Ability to load and save programs/modules via cloud/email

Feature

Macros or scripting support

Feature

FAQ

What does the i41CX+ app do?

The i41CX+ app is an advanced programmable RPN scientific calculator that includes workstation-class Computer Algebra System (CAS) capabilities. It functions as a virtual thermal printer/plotter and offers access to an extensive library of modules and programs, enhancing the functionality of the original HP-41CX.

What are the key features of this calculator app?

Key features include RPN logic with a deep memory stack, a large number of memory registers, over 400 built-in functions, a powerful CAS for symbolic calculations, a virtual thermal printer/plotter, and access to the entire HP-41 library of modules and programs. It also supports customizable skins, keyboard overlays, and iCloud syncing.

How much does the i41CX+ app cost?

Based on the provided information, the app is a paid application. There are no mentions of free trials, subscriptions, or in-app purchases, indicating a one-time purchase model.

What devices is i41CX+ compatible with?

The app is designed for iOS devices. It leverages iOS features such as iCloud support, notification center widgets, and integration with system keyboards, Bluetooth keyboards, and external displays.

Who would benefit from using the i41CX+ app?

This app is ideal for users who need a powerful and versatile scientific or engineering calculator. This includes students, scientists, engineers, and financial professionals who require advanced mathematical, statistical, and symbolic computation capabilities, as well as the ability to run legacy HP-41 programs.